<template>
  <div class="todo-footer" v-show="total">
    <label>
      <input type="checkbox" :checked="isAll" @change="checkAll"/>
    </label>
    <span>
        <span>已完成{{doneTotal}}</span> / 全部{{total}}
      </span>
    <button class="btn btn-danger">清除已完成任务</button>
  </div>
</template>

<script >
export default {
  name:'MyFooter',
  props:[
      'todos',
      'checkAllTodo',
  ],
  computed:{
    total(){
      return this.todos.length;
    },
    // eslint-disable-next-line vue/return-in-computed-property
    doneTotal(){
      const x = this.todos.reduce((pre,current)=>{
        return pre+(current.done? 1:0);
      },0)
      return x;
    },
    isAll(){
      return this.doneTotal === this.total && this.total >0
    }
  },
  methods:{
    checkAll(e){
      this.checkAllTodo(e.target.checked)
    }
  }
}
</script>



<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>